So is there any cases that the port is conflicted in my situation? If so, how can we configure the port for many instance of Ivy engine? We're using Amazon cloud so it's not a good way to buy different server for each Engine on cloud.

Thanks @ToanLC
I have one concern that if ES auto change to use new port, can Ivy connect to it via that port?
With ES we can define the fix port in config file but i don't see any config like that on ivy engine